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Zero-Weighted vs Regular Trackers
Once all the criteria have been evaluated, and a suitable set of trackers determined, hitting Add will add them into the scene. There are several options to control this (which should be configured before hitting Add).
The most important decision to make is whether you want a ZWT or a regular tracker. Intrinsically, the Add many trackers dialog produces ZWTs, since it has already computed the XYZ coordinates as part of its sanity-checking process. By using ZWTs, you can add many more trackers without appreciably affecting the re-solve time if you later need to change the shot. So using ZWTs is computationally very efficient, and is an easy way to go if you need more trackers to build a mesh from.
On the other hand, if you need additional trackers to improve the quality of the track, by adding more trackers in an under-populated region of 3-space or range of frames, then adding ZWTs will not help, since they do not affect the overall camera solution. Instead, check the Regular checkbox, and ordinary trackers will be created, still pre-solved with their XYZ coordinates. You can solve again using Refine mode, and the camera path will be updated taking into account the new trackers.
If you add hundreds or thousands of regular trackers, the solve time will increase substantially. Designed for the best camera tracking, SynthEyes is most efficient for long shots, not for thousands of trackers. To see why this choice was made, note that even if all the added trackers are of equal quality, the solution accuracy increases much
slower than the rate trackers are added. You can use some of the trackers for the solve, and keep the rest as ZWTs.
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